On Tue, Feb 09, 2016 at 01:52:22PM +0100, Maarten Lankhorst wrote:
> Instead of duplicating the functionality now that we no longer need
> to preserve dpll state we can move to using the upstream suspend helper.
>
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/drm_atomic_helper.c | 3 +
> drivers/gpu/drm/i915/i915_drv.c | 8 ---
> drivers/gpu/drm/i915/i915_drv.h | 1 +
> drivers/gpu/drm/i915/intel_display.c | 117 ++++++++++++-----------------------
> 4 files changed, 42 insertions(+), 87 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index 2b430b05f35d..a2d3b094f27c 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -2102,6 +2102,9 @@ int drm_atomic_helper_resume(struct drm_device *dev,
> err = drm_atomic_commit(state);
> drm_modeset_unlock_all(dev);
>
> + if (err)
> + drm_atomic_state_free(state);
> +
> return err;
> }
> EXPORT_SYMBOL(drm_atomic_helper_resume);
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 11d8414edbbe..fc9b552bfcd1 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -600,13 +600,7 @@ static int i915_drm_suspend(struct drm_device *dev)
>
> intel_suspend_gt_powersave(dev);
>
> - /*
> - * Disable CRTCs directly since we want to preserve sw state
> - * for _thaw. Also, power gate the CRTC power wells.
> - */
> - drm_modeset_lock_all(dev);
> intel_display_suspend(dev);
> - drm_modeset_unlock_all(dev);
>
> intel_dp_mst_suspend(dev);
>
> @@ -761,9 +755,7 @@ static int i915_drm_resume(struct drm_device *dev)
> dev_priv->display.hpd_irq_setup(dev);
> spin_unlock_irq(&dev_priv->irq_lock);
>
> - drm_modeset_lock_all(dev);
> intel_display_resume(dev);
> - drm_modeset_unlock_all(dev);
>
> intel_dp_mst_resume(dev);
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 8216665405eb..ef289514b97e 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1848,6 +1848,7 @@ struct drm_i915_private {
>
> enum modeset_restore modeset_restore;
> struct mutex modeset_restore_lock;
> + struct drm_atomic_state *modeset_restore_state;
>
> struct list_head vm_list; /* Global list of all address spaces */
> struct i915_gtt gtt; /* VM representing the global address space */
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index e496c130364d..4c91fd1c5222 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -6393,58 +6393,19 @@ static void intel_crtc_disable_noatomic(struct drm_crtc *crtc)
> */
> int intel_display_suspend(struct drm_device *dev)
> {
> - struct drm_mode_config *config = &dev->mode_config;
> - struct drm_modeset_acquire_ctx *ctx = config->acquire_ctx;
> - struct drm_atomic_state *state;
> - struct drm_crtc *crtc;
> - unsigned crtc_mask = 0;
> - int ret = 0;
> -
> - if (WARN_ON(!ctx))
> - return 0;
> -
> - lockdep_assert_held(&ctx->ww_ctx);
> - state = drm_atomic_state_alloc(dev);
> - if (WARN_ON(!state))
> - return -ENOMEM;
> -
> - state->acquire_ctx = ctx;
> - state->allow_modeset = true;
> -
> - for_each_crtc(dev, crtc) {
> - struct drm_crtc_state *crtc_state =
> - drm_atomic_get_crtc_state(state, crtc);
> -
> - ret = PTR_ERR_OR_ZERO(crtc_state);
> - if (ret)
> - goto free;
> -
> - if (!crtc_state->active)
> - continue;
> -
> - crtc_state->active = false;
> - crtc_mask |= 1 << drm_crtc_index(crtc);
> - }
> -
> - if (crtc_mask) {
> - ret = drm_atomic_commit(state);
> -
> - if (!ret) {
> - for_each_crtc(dev, crtc)
> - if (crtc_mask & (1 << drm_crtc_index(crtc)))
> - crtc->state->active = true;
> -
> - return ret;
> - }
> - }
> + struct drm_i915_private *dev_priv = to_i915(dev);
> + int ret;
>
> -free:
> - if (ret)
> + dev_priv->modeset_restore_state = drm_atomic_helper_suspend(dev);
> + ret = PTR_ERR_OR_ZERO(dev_priv->modeset_restore_state);
> + if (ret) {
> DRM_ERROR("Suspending crtc's failed with %i\n", ret);
> - drm_atomic_state_free(state);
> + dev_priv->modeset_restore_state = NULL;
> + }
I would use a local state pointer and only assign it to
modeset_restore_state once we know it's good.
> return ret;
> }
>
> +
Spurious newline.
> void intel_encoder_destroy(struct drm_encoder *encoder)
> {
> struct intel_encoder *intel_encoder = to_intel_encoder(encoder);
> @@ -15909,51 +15870,49 @@ intel_modeset_setup_hw_state(struct drm_device *dev)
>
> void intel_display_resume(struct drm_device *dev)
> {
> - struct drm_atomic_state *state = drm_atomic_state_alloc(dev);
> - struct intel_connector *conn;
> - struct intel_plane *plane;
> + struct drm_i915_private *dev_priv = to_i915(dev);
> + struct drm_atomic_state *state = dev_priv->modeset_restore_state;
> + struct drm_modeset_acquire_ctx ctx;
> struct drm_crtc *crtc;
> - int ret;
> + struct drm_crtc_state *crtc_state;
> + int ret, i;
> +
> + intel_modeset_setup_hw_state(dev);
Isn't something in there going to scream about locking?
> + i915_redisable_vga(dev);
> + dev_priv->modeset_restore_state = NULL;
>
> if (!state)
> return;
>
> - state->acquire_ctx = dev->mode_config.acquire_ctx;
> -
> - for_each_crtc(dev, crtc) {
> - struct drm_crtc_state *crtc_state =
> - drm_atomic_get_crtc_state(state, crtc);
> -
> - ret = PTR_ERR_OR_ZERO(crtc_state);
> - if (ret)
> - goto err;
> + drm_modeset_acquire_init(&ctx, 0);
> + state->acquire_ctx = &ctx;
>
> - /* force a restore */
> + for_each_crtc_in_state(state, crtc, crtc_state, i) {
> + /*
> + * Force recalculation even if we restore
> + * current state. With fast modeset this may not result
> + * in a modeset when the state is compatible.
> + */
> crtc_state->mode_changed = true;
> }
Hmm. Why do we need to set that exactly? If the current state doesn't
match the "to be restored" state, shouldn't something somewhere figure
out that we really need a modeset?
>
> - for_each_intel_plane(dev, plane) {
> - ret = PTR_ERR_OR_ZERO(drm_atomic_get_plane_state(state, &plane->base));
> - if (ret)
> - goto err;
> - }
> +retry:
> + ret = drm_modeset_lock_all_ctx(dev, &ctx);
> + if (ret == 0)
> + ret = drm_atomic_commit(state);
>
> - for_each_intel_connector(dev, conn) {
> - ret = PTR_ERR_OR_ZERO(drm_atomic_get_connector_state(state, &conn->base));
> - if (ret)
> - goto err;
> + if (ret == -EDEADLK) {
> + drm_modeset_backoff(&ctx);
> + goto retry;
> }
>
> - intel_modeset_setup_hw_state(dev);
> -
> - i915_redisable_vga(dev);
> - ret = drm_atomic_commit(state);
> - if (!ret)
> - return;
> + drm_modeset_drop_locks(&ctx);
> + drm_modeset_acquire_fini(&ctx);
>
> -err:
> - DRM_ERROR("Restoring old state failed with %i\n", ret);
> - drm_atomic_state_free(state);
> + if (ret) {
> + DRM_ERROR("Restoring old state failed with %i\n", ret);
> + drm_atomic_state_free(state);
> + }
> }
>
> void intel_modeset_gem_init(struct drm_device *dev)
> --
> 2.1.0
--
Ville Syrjälä
Intel OTC
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